No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Bright spots on clear anodized aluminum

We are anodizing on 6063 T6 alloy, and having a problem of bright spots which occur only after anodizing; this is not visible after pre cleaning in either caustic or phosphoric acid . At some difficult to access area wherein no buffing wheel can reach, has more of this defect, Can you let me know the reason why this happens.

Baldev Singh
sameer Eclipse - Vadodara, Gujarat, INDIA
2005

This problem is called "hot spots". They are caused by extrusion contacting carbon supports on the run-out table and being improperly cooled.
Improve cooling to solve the problem.

Juan Quintero
- Maracay, Aragua, Venezuela
2005

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: